US4348332A - Phosphonoformaldehyde, a process for its preparation and its use as an intermediate product for the preparation of medicaments - Google Patents
Phosphonoformaldehyde, a process for its preparation and its use as an intermediate product for the preparation of medicaments Download PDFInfo
- Publication number
- US4348332A US4348332A US06/308,717 US30871781A US4348332A US 4348332 A US4348332 A US 4348332A US 30871781 A US30871781 A US 30871781A US 4348332 A US4348332 A US 4348332A
- Authority
- US
- United States
- Prior art keywords
- acid
- phosphonoformaldehyde
- salt
- preparation
- formula
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- DEBRGDVXKPMWQZ-UHFFFAOYSA-N Formylphosphonate Chemical compound OP(O)(=O)C=O DEBRGDVXKPMWQZ-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title abstract description 13
- 239000003814 drug Substances 0.000 title description 4
- 239000013067 intermediate product Substances 0.000 title description 4
- 238000002360 preparation method Methods 0.000 title description 4
- 150000003839 salts Chemical class 0.000 claims abstract description 10
- 150000001875 compounds Chemical class 0.000 claims description 12
- 101150108015 STR6 gene Proteins 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- UTCHNZLBVKHYKC-UHFFFAOYSA-N 2-hydroxy-2-phosphonoacetic acid Chemical compound OC(=O)C(O)P(O)(O)=O UTCHNZLBVKHYKC-UHFFFAOYSA-N 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000003443 antiviral agent Substances 0.000 abstract description 2
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 abstract 1
- 101100386054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CYS3 gene Proteins 0.000 abstract 1
- 101150035983 str1 gene Proteins 0.000 abstract 1
- 239000002253 acid Substances 0.000 description 10
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- AJOBTOBDRQHEBJ-UHFFFAOYSA-N [cyano(hydroxy)methyl]phosphonic acid Chemical compound N#CC(O)P(O)(O)=O AJOBTOBDRQHEBJ-UHFFFAOYSA-N 0.000 description 7
- IYYIVELXUANFED-UHFFFAOYSA-N bromo(trimethyl)silane Chemical compound C[Si](C)(C)Br IYYIVELXUANFED-UHFFFAOYSA-N 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 6
- 150000004683 dihydrates Chemical class 0.000 description 5
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 4
- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 3
- 238000005160 1H NMR spectroscopy Methods 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- LARIUADDBBXHAD-UHFFFAOYSA-N dimethoxymethylphosphonic acid Chemical compound COC(OC)P(O)(O)=O LARIUADDBBXHAD-UHFFFAOYSA-N 0.000 description 3
- DTILCMQFCUCGAG-UHFFFAOYSA-N dimethoxyphosphoryl(dimethoxy)methane Chemical compound COC(OC)P(=O)(OC)OC DTILCMQFCUCGAG-UHFFFAOYSA-N 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- -1 phosphorus compound Chemical class 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 3
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 244000309464 bull Species 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- IIRVGTWONXBBAW-UHFFFAOYSA-M disodium;dioxido(oxo)phosphanium Chemical class [Na+].[Na+].[O-][P+]([O-])=O IIRVGTWONXBBAW-UHFFFAOYSA-M 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 2
- 150000007529 inorganic bases Chemical class 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 150000007530 organic bases Chemical class 0.000 description 2
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XUMKWCCJJRDWAO-UHFFFAOYSA-N 1-[diethoxyphosphoryl(ethoxy)methoxy]ethane Chemical compound CCOC(OCC)P(=O)(OCC)OCC XUMKWCCJJRDWAO-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 241000700584 Simplexvirus Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 125000005907 alkyl ester group Chemical group 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000000840 anti-viral effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- QIVKKNOVNLDFAF-UHFFFAOYSA-N diethoxymethylphosphonic acid Chemical compound CCOC(P(O)(O)=O)OCC QIVKKNOVNLDFAF-UHFFFAOYSA-N 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- UNJSCQGNECUXAI-UHFFFAOYSA-N dipropoxymethylphosphonic acid Chemical compound CCCOC(P(O)(O)=O)OCCC UNJSCQGNECUXAI-UHFFFAOYSA-N 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- UQEAIHBTYFGYIE-UHFFFAOYSA-N hexamethyldisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)C UQEAIHBTYFGYIE-UHFFFAOYSA-N 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 125000002560 nitrile group Chemical group 0.000 description 1
- 238000005580 one pot reaction Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 241001529453 unidentified herpesvirus Species 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/02—Phosphorus compounds
- C07F9/28—Phosphorus compounds with one or more P—C bonds
- C07F9/38—Phosphonic acids [RP(=O)(OH)2]; Thiophosphonic acids ; [RP(=X1)(X2H)2(X1, X2 are each independently O, S or Se)]
- C07F9/3804—Phosphonic acids [RP(=O)(OH)2]; Thiophosphonic acids ; [RP(=X1)(X2H)2(X1, X2 are each independently O, S or Se)] not used, see subgroups
- C07F9/3886—Acids containing the structure -C(=X)-P(=X)(XH)2 or NC-P(=X)(XH)2, (X = O, S, Se)
- C07F9/3891—Acids containing the structure -C(=X)-P(=X)(XH)2, (X = O, S, Se)
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/02—Phosphorus compounds
- C07F9/28—Phosphorus compounds with one or more P—C bonds
- C07F9/38—Phosphonic acids [RP(=O)(OH)2]; Thiophosphonic acids ; [RP(=X1)(X2H)2(X1, X2 are each independently O, S or Se)]
- C07F9/3804—Phosphonic acids [RP(=O)(OH)2]; Thiophosphonic acids ; [RP(=X1)(X2H)2(X1, X2 are each independently O, S or Se)] not used, see subgroups
- C07F9/3808—Acyclic saturated acids which can have further substituents on alkyl
Definitions
- the present invention relates to a certain new phosphorus compound and to an unobvious process for its production.
- the compound can be used as an intermediate product for the synthesis of pharmaceuticals.
- the compound of the invention finds particular use in the synthesis of an antiviral agent for use in medicine.
- Both radicals R represent an alkyl group with 1 to 4 carbon atoms, is warmed with water and, if it is desired to convert the free phosphonoformaldehyde into a salt thereof, is then reacted with a base.
- the phosphonoformaldehyde according to the invention can subsequently be converted into salts by conventional methods.
- dialkoxymethanephosphonic acids used as starting substances for the process according to the invention are known (see Bull. Chem. Soc. Japan 51 (1978), 2169), or they can be prepared by known processes.
- the two radicals R preferably represent, as the alkyl group with 1 to 4 carbon atoms, a methyl or ethyl group.
- Compounds of formula (II) which may be mentioned are, for example, dimethoxymethanephosphonic acid, diethoxymethanephosphonic acid and dipropoxymethanephosphonic acid.
- trimethylsilyl esters used, but it is sufficient for the trimethylsilyl esters such as are formed when dialkoxymethanephosphonic acid dialkyl esters are reacted with for example, trimethylbromosilane to be hydrolysed, without further purification.
- the process is thus particularly economical.
- the reaction time depends on the temperature and on the structure of the radical R, and is generally between 1 hour and 3 hours.
- the resulting compound of formula (I) can be isolated either by evaporating the solution or, for isolation in the form of a phosphonic acid salt, after adding to the solution an amount of an inorganic or organic base, for example an inorganic base such as an alkali metal hydroxide, which is sufficient for neutralisation of the solution, for example by adding aqueous sodium hydroxide solution.
- an inorganic base such as an alkali metal hydroxide
- Suitable organic bases are, for example, pyridine and triethylamine.
- aldehyde acetals into the free aldehydes with strong acids, for example hydrochloric acid, sulphuric acid or phosphoric acid.
- strong acids for example hydrochloric acid, sulphuric acid or phosphoric acid.
- acid and elevated temperatures are required (see Vogel, Text-Book of Organic Chemistry, 3rd Edition, Page 323, Longmans, London).
- the process can be carried out as a one-pot reaction, starting from the dialkoxymethanephosphonic acid alkyl ester, in a particularly economical manner if the stoichiometrically required amount of, for example, trimethylbromosilane is used to prepare the starting compound of the general formula (II).
- Phosphonoformaldehyde is an intermediate product for the preparation of medicaments, in particular for the preparation of phosphonohydroxyacetic acid, which has antiviral properties.
- phosphonoformaldehyde for formula (I) in the form of its sodium salt reacts with hydrocyanic acid to give the new compound phosphonohydroxyacetonitrile of formula (III), which can be converted into phosphonohydroxyacetic acid of formula (IV) by hydrolysis of the nitrile group, for example with hydrochloric acid.
- Phosphonohydroxyacetic acid has an action against herpes viruses in warm-blooded animals, in particular against type I and II herpes simplex viruses.
- the evaporation residue was dissolved in 600 ml of water, hexamethyldisiloxane and methanol were then distilled off at a temperature rising to about +80° C., the water which was also distilled off being continuously replaced, and the mixture was then stirred for a further hour at 80° to 85° C.
- the mixture was cooled, adjusted to a pH value of about 7.5 with 3 N NaOH and evaporated in vacuo and the crystalline residue was dried in vacuo.
- Phosphonoformaldehyde can be converted into phosphonohydroxyacetic acid in the following manner:
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Molecular Biology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
- Saccharide Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803039998 DE3039998A1 (de) | 1980-10-23 | 1980-10-23 | Phosphonoformaldehyd, ein verfahren zu seiner herstellung und seine verwendung als zwischenprodukt fuer die herstellung von arzneimittel |
| DE3039998 | 1980-10-23 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/370,890 Division US4447367A (en) | 1980-10-23 | 1982-04-22 | Phosphonoformaldehyde, a process for its preparation and its use as an intermediate product for the preparation of medicaments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US4348332A true US4348332A (en) | 1982-09-07 |
Family
ID=6115022
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/308,717 Expired - Fee Related US4348332A (en) | 1980-10-23 | 1981-10-05 | Phosphonoformaldehyde, a process for its preparation and its use as an intermediate product for the preparation of medicaments |
| US06/370,890 Expired - Fee Related US4447367A (en) | 1980-10-23 | 1982-04-22 | Phosphonoformaldehyde, a process for its preparation and its use as an intermediate product for the preparation of medicaments |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/370,890 Expired - Fee Related US4447367A (en) | 1980-10-23 | 1982-04-22 | Phosphonoformaldehyde, a process for its preparation and its use as an intermediate product for the preparation of medicaments |
Country Status (11)
| Country | Link |
|---|---|
| US (2) | US4348332A (da) |
| EP (1) | EP0050778B1 (da) |
| JP (1) | JPS5795995A (da) |
| AT (1) | ATE8052T1 (da) |
| AU (1) | AU7674781A (da) |
| CA (1) | CA1187895A (da) |
| DE (2) | DE3039998A1 (da) |
| DK (1) | DK467581A (da) |
| ES (1) | ES506461A0 (da) |
| FI (1) | FI69081C (da) |
| NO (1) | NO813398L (da) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5578190A (en) * | 1984-12-28 | 1996-11-26 | Monsanto Company | Process for the preparation of glyphosate and glyphosate derivatives |
| USRE35389E (en) * | 1985-09-11 | 1996-12-03 | Hoechst Aktiengesellschaft | Process for the preparation of N-phosphonomethylglycine |
| US6054608A (en) * | 1997-05-05 | 2000-04-25 | Monsanto Company | Method for preparing formylphosphonic acid |
| US6274760B1 (en) | 2000-03-14 | 2001-08-14 | Monsanto Co. | Preparation of formylphosphonic acid from tertiary aminomethylphosphonic acid N-oxides |
| US6441223B1 (en) | 2000-11-30 | 2002-08-27 | Monsanto Technology Llc | Method of making phosphorus-containing compounds and products thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2900408A (en) * | 1956-05-08 | 1959-08-18 | Henkel & Cie Gmbh | Acid esters of acyl-phosphorous acids and method of making the same |
| US3032500A (en) * | 1959-12-31 | 1962-05-01 | American Cyanamid Co | Sequestration of metal ions |
| US3784590A (en) * | 1969-01-02 | 1974-01-08 | Merck & Co Inc | Hydroxy and imino containing phosphonic acid diesters |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4339443A (en) * | 1978-09-22 | 1982-07-13 | Fbc Limited | Compounds and compositions |
| DE2941384A1 (de) * | 1979-10-12 | 1981-04-23 | Bayer Ag, 5090 Leverkusen | Phosphono-hydroxy-essigsaeure, verfahren zu ihrer herstellung sowie ihre verwendung als arzneimittel |
-
1980
- 1980-10-23 DE DE19803039998 patent/DE3039998A1/de not_active Withdrawn
-
1981
- 1981-10-05 US US06/308,717 patent/US4348332A/en not_active Expired - Fee Related
- 1981-10-07 NO NO813398A patent/NO813398L/no unknown
- 1981-10-12 AT AT81108193T patent/ATE8052T1/de not_active IP Right Cessation
- 1981-10-12 DE DE8181108193T patent/DE3164330D1/de not_active Expired
- 1981-10-12 EP EP81108193A patent/EP0050778B1/de not_active Expired
- 1981-10-19 JP JP56165880A patent/JPS5795995A/ja active Granted
- 1981-10-21 FI FI813290A patent/FI69081C/fi not_active IP Right Cessation
- 1981-10-21 CA CA000388445A patent/CA1187895A/en not_active Expired
- 1981-10-22 ES ES506461A patent/ES506461A0/es active Granted
- 1981-10-22 DK DK467581A patent/DK467581A/da unknown
- 1981-10-23 AU AU76747/81A patent/AU7674781A/en not_active Abandoned
-
1982
- 1982-04-22 US US06/370,890 patent/US4447367A/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2900408A (en) * | 1956-05-08 | 1959-08-18 | Henkel & Cie Gmbh | Acid esters of acyl-phosphorous acids and method of making the same |
| US3032500A (en) * | 1959-12-31 | 1962-05-01 | American Cyanamid Co | Sequestration of metal ions |
| US3784590A (en) * | 1969-01-02 | 1974-01-08 | Merck & Co Inc | Hydroxy and imino containing phosphonic acid diesters |
Non-Patent Citations (5)
| Title |
|---|
| Ackerman et al., "J. Am. Chem. Soc.", vol. 78 (1956), pp. 4444-4447. * |
| Berlin et al., "J. Am. Chem. Soc.", vol. 86 (1964), pp. 3862-3866. * |
| Kabachnik et al., "Chem. Abstracts", vol. 41 (1947), col. 88(d). * |
| Morita et al., "Bull. Chem. Soc. Japan", vol. 51, (7), (1978), pp. 2169-2170. * |
| Warren, "Angew. Chem.", vol. 7, No. 8 (1968), pp. 608-617. * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5578190A (en) * | 1984-12-28 | 1996-11-26 | Monsanto Company | Process for the preparation of glyphosate and glyphosate derivatives |
| USRE35389E (en) * | 1985-09-11 | 1996-12-03 | Hoechst Aktiengesellschaft | Process for the preparation of N-phosphonomethylglycine |
| US6054608A (en) * | 1997-05-05 | 2000-04-25 | Monsanto Company | Method for preparing formylphosphonic acid |
| US6762317B2 (en) | 1997-05-05 | 2004-07-13 | Monsanto Company | Method for preparing formylphosphonic acid |
| US20040225147A1 (en) * | 1997-05-05 | 2004-11-11 | Monsanto Company | Method for preparing formylphosphonic acid |
| US7091376B2 (en) | 1997-05-05 | 2006-08-15 | Monsanto Technology Llc | Method for preparing formylphosphonic acid |
| US7294733B2 (en) | 1997-05-05 | 2007-11-13 | Monsanto Technology Llc | Method for preparing formylphosphonic acid |
| US6274760B1 (en) | 2000-03-14 | 2001-08-14 | Monsanto Co. | Preparation of formylphosphonic acid from tertiary aminomethylphosphonic acid N-oxides |
| US6441223B1 (en) | 2000-11-30 | 2002-08-27 | Monsanto Technology Llc | Method of making phosphorus-containing compounds and products thereof |
| US20030078446A1 (en) * | 2000-11-30 | 2003-04-24 | Monsanto Technology Llc | Method of making phosphorus-containing compounds and products thereof |
| US6864218B2 (en) | 2000-11-30 | 2005-03-08 | Monsanto Technology Llc | Method of making phosphorus-containing compounds and products thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| FI813290L (fi) | 1982-04-24 |
| NO813398L (no) | 1982-04-26 |
| DK467581A (da) | 1982-04-24 |
| CA1187895A (en) | 1985-05-28 |
| JPH0148914B2 (da) | 1989-10-20 |
| ES8206542A1 (es) | 1982-08-16 |
| DE3164330D1 (en) | 1984-07-26 |
| EP0050778B1 (de) | 1984-06-20 |
| DE3039998A1 (de) | 1982-06-03 |
| US4447367A (en) | 1984-05-08 |
| ES506461A0 (es) | 1982-08-16 |
| FI69081B (fi) | 1985-08-30 |
| FI69081C (fi) | 1985-12-10 |
| ATE8052T1 (de) | 1984-07-15 |
| EP0050778A1 (de) | 1982-05-05 |
| JPS5795995A (en) | 1982-06-15 |
| AU7674781A (en) | 1982-04-29 |
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